RK3288 pmu_gpio0 drive strength setting have no higher 16 writing
corresponding bits, need to read before write the register.
Signed-off-by: David Wu <david...@rock-chips.com>
---
Change in v3:
- Add some comment
drivers/pinctrl/rockchip/pinctrl-rk3288.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/pinctrl/rockchip/pinctrl-rk3288.c
b/drivers/pinctrl/rockchip/pinctrl-rk3288.c
index 6ae9f1c76e..d1b9aeb3d9 100644
--- a/drivers/pinctrl/rockchip/pinctrl-rk3288.c
+++ b/drivers/pinctrl/rockchip/pinctrl-rk3288.c
@@ -143,8 +143,15 @@ static int rk3288_set_drive(struct rockchip_pin_bank *bank,
return ret;
}
- /* enable the write to the equivalent lower bits */
- data = ((1 << ROCKCHIP_DRV_BITS_PER_PIN) - 1) << (bit + 16);
+ /* bank0 is special, there are no higher 16 bit writing bits. */
+ if (bank->bank_num == 0) {
+ regmap_read(regmap, reg, &data);
+ data &= ~(((1 << ROCKCHIP_DRV_BITS_PER_PIN) - 1) << bit);
+ } else {
+ /* enable the write to the equivalent lower bits */
+ data = ((1 << ROCKCHIP_DRV_BITS_PER_PIN) - 1) << (bit + 16);
+ }
+
data |= (ret << bit);
ret = regmap_write(regmap, reg, data);
return ret;
--
2.19.1
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